A cleanroom is an environment where airborn particulates
are controlled through an exchange of highly filtered air using a high
effeciency particulate air (HEPA) filtering system, and through minimization
of activities that generate particles.
A class 100 cleanroom maintains less than one hundred particles
larger than 0.5 microns in each cubic foot of air space.
A class 1000 cleanroom has less than 1000 such particles per cubic
foot.
In addition to particle control, the cleanroom is temperature and
humidity controlled to 70F, 45% RH.
